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Steel Making

Surface Carburizing
Carburizing, commonly called case-hardening, is the art of pr...

Phosphorus
PHOSPHORUS is an element (symbol P) which enters the metal fr...

The Thermo-couple
With the application of the thermo-couple, the measurement of...

Flange Shields For Furnaces
Such portable flame shields as the one illustrated in Fig. 1...

Rate Of Cooling
At the option of the manufacturer, the above treatment of gea...

Sulphur
Sulphur is another impurity and high sulphur is even a greate...

High Speed Steel
For centuries the secret art of making tool steel was handed ...

Mushet And Bessemer
That Mushet was "used" by Ebbw Vale against Bessemer is, perh...

Conclusions
Martien was probably never a serious contender for the honor ...

Silicon
Silicon prevents, to a large extent, defects such as gas bubb...

Detrimental Elements
Sulphur and phosphorus are two elements known to be detrimen...

Plant For Forging Rifle Barrels
The forging of rifle barrels in large quantities and heat-tre...

Crucible Steel
Crucible steel is still made by melting material in a clay or...

Shrinking And Enlarging Work
Steel can be shrunk or enlarged by proper heating and cooling...

High-carbon Machinery Steel
The carbon content of this steel is above 30 points and is ha...

Tempering Colors On Carbon Steels
Opinions differ as to the temperature which is indicated by t...

Highly Stressed Parts
The highly stressed parts on the Liberty engine consisted of ...

Crankshaft
The crankshaft was the most highly stressed part of the entir...

The Influence Of Size
The size of the piece influences the physical properties obta...

Process Of Carburizing
Carburizing imparts a shell of high-carbon content to a low-...



An Automatic Temperature Control Pyrometer






Category: PYROMETRY AND PYROMETERS

Automatic temperature control instruments are similar to the Brown
indicating high resistance pyrometer with the exception that the
pointer is depressed at intervals of every 10 sec. upon contact-making
devices. No current passes through the pointer which simply depresses
the upper contact device tipped with platinum, which in turn comes
in contact with the lower contact device, platinum-tipped, and the
circuit is completed through these two contacts. The current is very
small, about 1/10 amp., as it is only necessary to operate the relay
which in turn operates the switch or valve. A small motor is used to
depress the pointer at regular intervals. The contact-making device
is adjustable throughout the scale range of the instrument, and an
index pointer indicates the point on the instrument at which the
temperature is being controlled. The space between the two contacts
on the high and low side, separated by insulating material, is
equivalent to 1 per cent of the scale range. A control of temperature
is therefore possible within 1 per cent of the total scale range.
Figure 131 shows this attached to a small furnace.





Next: Pyrometers For Molten Metal

Previous: Brown Automatic Signaling Pyrometer



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